07765698 is referenced by 10 patents and cites 166 patents.

A method of making an electret article, from a polymeric article that has a zeta potential of greater than or less than −7.5 millivolts. The article is charged by contacting it with an aqueous liquid that has a pH and conductivity as follows: (i) if the article has a zeta potential of −7.5 mV or less, then the contacting liquid has pH greater than 7 and a conductivity of 5 to 9,000 microSiemens per centimeter; and (ii) if the article has a zeta potential of greater than −7.5 mV, then the contacting liquid has a pH of 7 or less and a conductivity of 5 to 5,500 microSiemens per centimeter. An electret article made in this manner can provide improved electret performance, particularly in electret filtration articles.

Title
Method of making electret articles based on zeta potential
Application Number
12/131770
Publication Number
7765698 (B2)
Application Date
June 2, 2008
Publication Date
August 3, 2010
Inventor
Daniel A Japuntich
St. Paul
MN, US
Rahul R Shah
Woodbury
MN, US
Justin L Keough
Vadnais Heights
MN, US
Nathan E Schultz
Lakeland
MN, US
Shih Hung Chou
Maplewood
MN, US
Fuming B Li
Woodbury
MN, US
Marvin E Jones
Grant
MN, US
John M Sebastian
Oakdale
MN, US
Agent
Karl G Hanson
Assignee
3M Innovative Properties Company
MN, US
IPC
B01L 9/00
B01D 21/00
B23P 15/16
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